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📝 Cause of thrashing

📖 From Operating System • 9. Virtual Memory • 13 questions available

Practice MCQs for Cause of thrashing. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-26

3
Easy Questions
6
Medium Questions
4
Hard Questions

📝 Sample Questions

Q1. What is the name of the fault that occurs when a process accesses a page with the invalid bit set?

🔹 A. Page fault
🔹 B. Segmentation fault
🔹 C. Bus error
🔹 D. General protection fault

💡 Difficulty: easy | ✅ Correct: A

Q2. How does the internal table kept with the process control block help the OS distinguish between valid and invalid page references?

🔹 A. It stores the physical address of every page
🔹 B. It records the invalid‑bit status for each virtual page
🔹 C. It lists the free frames in the system
🔹 D. It contains the program’s instruction pointer

💡 Difficulty: medium | ✅ Correct: B

Q3. Explain why pure demand paging can cause thrashing when the working set exceeds the number of available frames.

🔹 A. Because the OS will pre‑load all pages at start‑up
🔹 B. Because each page fault forces a disk read, repeatedly evicting pages still needed
🔹 C. Because the CPU slows down due to context switches
🔹 D. Because the invalid bit is never cleared

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 Basic concepts of Demand Paging📝 Performance of demand paging📝 Copy on Write in virtual Memory📝 Basic page replacement in virtual Memory📝 FIFO page replacement
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